Detectionhightest
Microsoft Defender Blocked from Loading Unsigned DLL
Detects Code Integrity (CI) engine blocking Microsoft Defender's processes (MpCmdRun and NisSrv) from loading unsigned DLLs which may be an attempt to sideload arbitrary DLL
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Log Source
Windowssecurity-mitigations
ProductWindows← raw: windows
Servicesecurity-mitigations← raw: security-mitigations
Detection Logic
Detection Logic1 selector
detection:
selection:
EventID:
- 11
- 12 # MDE: ExploitGuardNonMicrosoftSignedBlocked
ProcessPath|endswith:
- '\MpCmdRun.exe'
- '\NisSrv.exe'
condition: selectionFalse Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Rule Metadata
Rule ID
0b0ea3cc-99c8-4730-9c53-45deee2a4c86
Status
test
Level
high
Type
Detection
Created
Tue Aug 02
Modified
Wed Sep 28
Author
Path
rules/windows/builtin/security_mitigations/win_security_mitigations_defender_load_unsigned_dll.yml
Raw Tags
attack.privilege-escalationattack.persistenceattack.defense-evasionattack.t1574.001